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PartsTable / COMPONENT / MS21937-4H
MS21937-4H ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

INSERT PLATE,SYNCHRONIZER,TRANSM. Key specifications include material: ALUMINUM ALLOY 2014, thread_size: 7/16IN-20 IN, thread_class: 3B, thread_length: 0.344 INCHES NOMINAL IN, overall_length: 0.500 INCHES NOMINAL IN, style_designator: HEXAGON, INTERNAL THREAD, SHOULDERED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-222-1912, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MS21937-4H
NSN: 4730-00-222-1912
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialALUMINUM ALLOY 2014
thread_size7/16IN-20 IN
thread_class3B
thread_length0.344 INCHES NOMINAL IN
overall_length0.500 INCHES NOMINAL IN
style_designatorHEXAGON, INTERNAL THREAD, SHOULDERED
thread_directionRIGHT-HAND
surface_treatmentANODIZE
length_to_shoulder0.344 INCHES NOMINAL IN
width_across_flats1.000 INCHES NOMINAL IN
screw_thread_locationINTERNAL
casehardening_indicatorNOT CASEHARDENED
NSN4730-00-222-1912
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21937-4H · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SURFACE TREATMENT: CADMIUM OVERALL
•
SPECIFICATION/STANDARD DATA: 88044-AN818 GOVERNMENT STANDARD
•
THREAD QUANTITY PER INCH: 20
•
NUT HEIGHT: 0.609 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.593 INCHES NOMINAL IN
•
NOMINAL TUBE OUTSIDE DIAMETER: 0.250 INCHES IN
•
SMALLEST INSIDE DIAMETER: 0.305 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTCADMIUM OVERALL
END ITEM IDENTIFICATIONGRUMMAN A-10 ACFT
SPECIFICATION/STANDARD DATA88044-AN818 GOVERNMENT STANDARD
THREAD QUANTITY PER INCH20
NUT HEIGHT0.609 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.593 INCHES NOMINAL IN
NOMINAL TUBE OUTSIDE DIAMETER0.250 INCHES IN
SMALLEST INSIDE DIAMETER0.305 INCHES NOMINAL IN
LENGTH TO SHOULDER0.532 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
133591Interchangeable
interchangeable cross-reference
interchangeable
FFS92TYPE1STYLE2SInterchangeable
interchangeable cross-reference
interchangeable
26259Interchangeable
interchangeable cross-reference
interchangeable
13965Interchangeable
interchangeable cross-reference
interchangeable
2910006088559Interchangeable
interchangeable cross-reference
interchangeable
13359Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21937-4H?
MS21937-4H is a INSERT PLATE,SYNCHRONIZER,TRANSM.
What parts can replace MS21937-4H?
There are 15 known substitutes for MS21937-4H: 133591, FFS92TYPE1STYLE2S, 26259 and 12 more. Substitute compatibility should be verified for your specific system.
Is MS21937-4H still available?
MS21937-4H is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026